CN103109053B - Catalyst deterioration detecting apparatus and method - Google Patents
Catalyst deterioration detecting apparatus and method Download PDFInfo
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- CN103109053B CN103109053B CN201080040961.5A CN201080040961A CN103109053B CN 103109053 B CN103109053 B CN 103109053B CN 201080040961 A CN201080040961 A CN 201080040961A CN 103109053 B CN103109053 B CN 103109053B
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- 239000003054 catalyst Substances 0.000 title claims abstract description 185
- 230000006866 deterioration Effects 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title description 5
- 239000000446 fuel Substances 0.000 claims abstract description 198
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 100
- 239000001301 oxygen Substances 0.000 claims abstract description 100
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 100
- 238000002485 combustion reaction Methods 0.000 claims abstract description 57
- 230000015556 catabolic process Effects 0.000 claims abstract description 52
- 238000006731 degradation reaction Methods 0.000 claims abstract description 52
- 239000007788 liquid Substances 0.000 claims abstract description 45
- 238000007599 discharging Methods 0.000 claims abstract description 31
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 239000012530 fluid Substances 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 abstract description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 12
- 239000007789 gas Substances 0.000 description 6
- 238000010304 firing Methods 0.000 description 5
- 239000002828 fuel tank Substances 0.000 description 5
- 239000011435 rock Substances 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 150000001298 alcohols Chemical class 0.000 description 2
- 239000003502 gasoline Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- BZLVMXJERCGZMT-UHFFFAOYSA-N Methyl tert-butyl ether Chemical compound COC(C)(C)C BZLVMXJERCGZMT-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 239000000700 radioactive tracer Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/007—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0626—Measuring or estimating parameters related to the fuel supply system
- F02D19/0634—Determining a density, viscosity, composition or concentration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0639—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
- F02D19/0642—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
- F02D19/0647—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02D19/0686—Injectors
- F02D19/0692—Arrangement of multiple injectors per combustion chamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
- F02D19/081—Adjusting the fuel composition or mixing ratio; Transitioning from one fuel to the other
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/02—Catalytic activity of catalytic converters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0416—Methods of control or diagnosing using the state of a sensor, e.g. of an exhaust gas sensor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1402—Exhaust gas composition
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1624—Catalyst oxygen storage capacity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
- F02D41/1441—Plural sensors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The object of the present invention is to provide a kind of technology detecting the deterioration of the exhaust emission control catalyst applied in the internal-combustion engine that can use gaseous fuel and liquid fuel exactly.In the present invention, even if change to dense side when only making the air fuel ratio of exhaust of discharging from internal-combustion engine, when being also difficult to make occlusion in the gaseous fuel that the oxygen evolution of exhaust emission control catalyst goes out, whether catalyst degradation judging part judges exhaust emission control catalyst deterioration based on the one party in following change, above-mentionedly to be changed to: the change of only rare side of the output of oxygen concentration detection unit, and the dense side of the output of oxygen concentration detection unit and the change of rare side.
Description
Technical field
The present invention relates to catalyst deterioration detecting apparatus and catalyst degradation detection method.
Background technique
When using the oxygen storage capacity (OSC) of catalyzer to carry out degradation to the catalyzer arranged in the exhaust passageway utilizing rock gas as the internal-combustion engine of fuel, there is the O that the oxygen concentration flowed out from catalyzer is detected
2sensor obtains the situation of improper value because of unburned methane reaction.Therefore, the determinating reference value of change catalyst degradation is disclosed to carry out the technology (such as with reference to patent documentation 1) of catalyst degradation detection.Thus, in patent documentation 1 for detecting catalyst degradation exactly.
Patent documentation 1: Japanese Unexamined Patent Publication 11-159375 publication
When using the oxygen storage capacity of catalyzer to carry out the degradation of catalyzer, make the air fuel ratio of exhaust of discharging from internal-combustion engine change to dense side to make oxygen discharge from catalyzer or to make the air fuel ratio of exhaust change to rare side to make catalyst occludes oxygen, and detect the oxygen concentration in catalyzer downstream now.Herein, when utilizing rock gas as fuel, catalyzer stoichiometric point is positioned at dense side, because the knock limit of dense side is narrow, the air fuel ratio of exhaust therefore cannot be made to change to dense side significantly.Further, for rock gas, in fuel, more than 90% is methane, and the ability that methane makes oxygen discharge from catalyzer is lower, and the oxygen concentration in catalyzer downstream therefore cannot be made similarly to increase with the situation making the air fuel ratio of exhaust change to dense side.Therefore, when utilizing rock gas as fuel, catalyst degradation cannot be detected exactly.
Summary of the invention
The present invention completes in view of said circumstances, its object is to, and provides a kind of technology detecting the deterioration of the exhaust emission control catalyst applied in the internal-combustion engine that can use gaseous fuel and liquid fuel exactly.
The present invention adopts following structure.That is, the present invention relates to a kind of catalyst deterioration detecting apparatus, above-mentioned catalyst deterioration detecting apparatus possesses:
Exhaust emission control catalyst, it is arranged at the exhaust passageway of the internal-combustion engine that can use gaseous fuel and liquid fuel;
Oxygen concentration detection unit, it is arranged at than above-mentioned exhaust emission control catalyst above-mentioned exhaust passageway downstream; And
Catalyst degradation judging part, it makes the air fuel ratio of the exhaust of discharging from above-mentioned internal-combustion engine change to dense side and rare side, the change of the change of this air fuel ratio and the output of above-mentioned oxygen concentration detection unit is compared, judges the whether deterioration of above-mentioned exhaust emission control catalyst
Wherein,
Even if change to dense side when only making the air fuel ratio of the exhaust of discharging from above-mentioned internal-combustion engine, when being also difficult to make occlusion in the gaseous fuel that the oxygen evolution of above-mentioned exhaust emission control catalyst goes out, whether above-mentioned catalyst degradation judging part judges the deterioration of above-mentioned exhaust emission control catalyst based on the one party in following change, above-mentionedly to be changed to: the change of the air fuel ratio only output of above-mentioned oxygen concentration detection unit when rare side, and the change of air fuel ratio output of above-mentioned oxygen concentration detection unit when dense side and rare side.
According to the present invention, when based on a side, the change of only rare side of the output of oxygen concentration detection unit judge exhaust emission control catalyst whether deterioration time, even if it is also harmless that the air fuel ratio of exhaust cannot be made to change to dense side significantly, and the oxygen concentration in catalyzer downstream can be made similarly to decline with the situation making the air fuel ratio of exhaust change to rare side.When based on the opposing party, the dense side of output of oxygen concentration detection unit and the change of rare side judge exhaust emission control catalyst whether deterioration time, the output of oxygen concentration detection unit when can also consider to make the air fuel ratio of exhaust to change to dense side.Thereby, it is possible to detect the deterioration of exhaust emission control catalyst exactly.
When above-mentioned catalyst degradation judging part based on above-mentioned oxygen concentration detection unit output the change of dense side and rare side judge above-mentioned exhaust emission control catalyst whether deterioration time, best feed fluid fuel.
For liquid fuel, catalyzer stoichiometric point is not positioned at dense side, there will not be the situation that the knock limit of dense side is narrow yet, therefore, it is possible to make the air fuel ratio of exhaust change to dense side significantly.And, even if liquid fuel from make the air fuel ratio of the exhaust of discharging from internal-combustion engine change to dense side, be also difficult to make occlusion to go out in the oxygen evolution of exhaust emission control catalyst gaseous fuel different, the situation that the oxygen concentration that can make catalyzer downstream and the air fuel ratio making exhaust change to dense side similarly rises.Thus, the output of oxygen concentration detection unit when also can change to dense side according to making the air fuel ratio of exhaust detects the deterioration of exhaust emission control catalyst exactly.
When supplied liquid fuel contains oxygenated fuel, the concentration of best above-mentioned oxygenated fuel is higher, reduces the ratio of the liquid fuel supplied.
The concentration of oxygenated fuel is higher, more easily makes occlusion go out in the oxygen evolution of exhaust emission control catalyst when making the air fuel ratio of the exhaust of discharging from internal-combustion engine change to dense side.Therefore, the concentration of oxygenated fuel is higher, and reduce the ratio of the liquid fuel supplied, this also can make occlusion go out in the oxygen evolution of exhaust emission control catalyst.
The temperature of above-mentioned exhaust emission control catalyst is higher, reduces the ratio of the liquid fuel supplied.
The temperature of exhaust emission control catalyst is higher, more easily makes occlusion go out in the oxygen evolution of exhaust emission control catalyst when making the air fuel ratio of the exhaust of discharging from internal-combustion engine change to dense side.Therefore, the temperature of exhaust emission control catalyst is higher, and reduce the ratio of the liquid fuel supplied, this also can make occlusion go out in the oxygen evolution of exhaust emission control catalyst.
Above-mentioned catalyst degradation judging part preferably makes central point offset to rare side, and this central point makes central point when changing to dense side and rare side from the air fuel ratio of the exhaust of internal-combustion engine discharge.
Thus, even if the catalyzer stoichiometric point of gaseous fuel be positioned at dense side, dense side knock limit narrow, also can offset to rare side due to central point, and the air fuel ratio of exhaust of discharging from internal-combustion engine can be made to change to dense side and rare side.
Adopt following structure in the present invention.That is, the present invention relates to a kind of catalyst degradation detection method, be the degradation detection of the exhaust emission control catalyst of the exhaust passageway being arranged at the internal-combustion engine that can use gaseous fuel and liquid fuel, the degradation detection of this exhaust emission control catalyst has:
Oxygen concentration detecting step, its oxygen concentration contrasting above-mentioned exhaust emission control catalyst above-mentioned exhaust passageway downstream detects; And
Catalyst degradation determining step, it makes the air fuel ratio of the exhaust of discharging from above-mentioned internal-combustion engine change to dense side and rare side, the change of the oxygen concentration detected in the change of this air fuel ratio and above-mentioned oxygen concentration detecting step is compared, judges the whether deterioration of above-mentioned exhaust emission control catalyst
Even if change to dense side only making the air fuel ratio of the exhaust of discharging from above-mentioned internal-combustion engine, when being also difficult to make occlusion in the gaseous fuel that the oxygen evolution of above-mentioned exhaust emission control catalyst goes out to make above-mentioned internal combustion engine operation, whether above-mentioned catalyst degradation determining step judges the deterioration of above-mentioned exhaust emission control catalyst based on the one party in following change, above-mentionedly to be changed to: the change of the oxygen concentration that air fuel ratio only detects in above-mentioned oxygen concentration detecting step when rare side, and the change of oxygen concentration that air fuel ratio detects in above-mentioned oxygen concentration detecting step when dense side and rare side.
According to the present invention, the deterioration of exhaust emission control catalyst can be detected exactly.
According to the present invention, the deterioration of the exhaust emission control catalyst applied in the internal-combustion engine that can use gaseous fuel and liquid fuel can be detected exactly.
Accompanying drawing explanation
Fig. 1 is the figure of the Sketch of the internal-combustion engine illustrated involved by embodiments of the invention 1.
Fig. 2 is the figure of the air fuel ratio of the exhaust illustrated involved by embodiment 1 and the model of oxygen concentration similar with it.
Fig. 3 is the figure of the air fuel ratio of the exhaust illustrated involved by embodiment 1 and the model of oxygen concentration not similar with it.
Fig. 4 is the figure of the air fuel ratio of the exhaust illustrated involved by embodiment 1 and the model of oxygen concentration not similar with it.
Catalyst degradation when Fig. 5 is the use CNG illustrated involved by embodiment 1 judges the flow chart of control program.
Fig. 6 is the figure of the relation illustrated between oxygenated fuel concentration involved by embodiment 1 and liquid fuel emitted dose.
Fig. 7 is the figure that the oxygen storage capacity corresponding to the deterioration of the exhaust emission control catalyst involved by embodiment 1 is shown.
Fig. 8 is the figure of the relation illustrated between catalyst temperature involved by embodiment 1 and liquid fuel emitted dose.
Embodiment
Below, specific embodiments of the invention are described.
Embodiment 1
Fig. 1 is the figure of the Sketch of the internal-combustion engine illustrated involved by embodiments of the invention 1.The fuel of the internal-combustion engine 1 shown in Fig. 1 can adopt following liquid fuel: the petroleum-type liquid fuels such as gasoline, the oxygenated fuels such as the alcohols such as ethanol, methyl alcohol or MTBE is mixed in the mixed fluid fuel of the petroleum-type liquid fuels such as gasoline, etc.Further, the fuel of internal-combustion engine 1 also can adopt the gaseous fuels such as compressed natural gas (CNG (CompressedNaturalGas)).In the present embodiment, enumerate use be mixed with the liquid fuel of oxygenated fuel in the oil and use CNG to be example as the situation of gaseous fuel.
Piston 3 is configured in the cylinder 2 of internal-combustion engine 1 in the mode slid freely.Top in cylinder 2, divides with the upper wall of cylinder 2 and the end face of inwall and piston 3 and forms firing chamber 4.The top of firing chamber 4 is connected to intake duct 5 and air outlet flue 6.The mixed gas be configured with on the top of cylinder 2 in countercylinder 2 carries out the spark plug 7 of lighting a fire.The opening portion of intake duct 5 pairs of firing chambers 4 is by intake valve 8 opening and closing.Further, the opening portion of air outlet flue 6 pairs of firing chambers 4 is by exhaust valve 9 opening and closing.The upstream side of intake duct 5 is connected with suction tude 10.The downstream side of air outlet flue 6 is connected with outlet pipe 11.Intake duct 5 and the suction tude 10 of the present embodiment correspond to inlet air pathway.Air outlet flue 6 and the outlet pipe 11 of the present embodiment correspond to exhaust passageway of the present invention.
The first Fuelinjection nozzle 12 to the air inlet injecting LPG in liquefied condition of circulation in intake duct 5 is configured with in intake duct 5.The second Fuelinjection nozzle 13 air inlet of circulation in suction tude 10 being sprayed to CNG is configured with in suction tude 10.To mix with air inlet by making the fuel that ejects from the first Fuelinjection nozzle 12 and the second Fuelinjection nozzle 13 and form mixed gas.First Fuelinjection nozzle 12 supply is stored in the liquid fuel of the first fuel tank 14.First fuel tank 14 is configured with the oxygenated fuel concentration sensor 15 that in liquid fuel, the concentration of oxygenated fuel detects.Second Fuelinjection nozzle 13 supply is stored in the CNG of the second fuel tank 16.The position of upstream side is leaned on to be configured with closure 17 at ratio second Fuelinjection nozzle 13 of suction tude 10.The air inflow of closure 17 to circulation in suction tude 10 can be utilized to regulate.
The air-fuel ratio sensor 18 that the air fuel ratio of the exhaust of discharging from internal-combustion engine 1 is detected is configured with in outlet pipe 11.The exhaust emission control catalyst 19 that the exhaust of discharging from internal-combustion engine 1 is purified is configured with in ratio air-fuel ratio sensor 18 position downstream of outlet pipe 11.Exhaust emission control catalyst 19 has following function: discharge oxygen when the air fuel ratio of the exhaust flowed into exhaust emission control catalyst 19 is dense, the occlusion oxygen when the air-fuel ratio of the exhaust flowed into exhaust emission control catalyst 19.As exhaust emission control catalyst 19, such as, there is three-way catalyst etc.Exhaust emission control catalyst 19 is configured with the catalyst-temperature pickup 20 detected the temperature of exhaust emission control catalyst 19.The O that the oxygen concentration of the exhaust of flowing out from exhaust emission control catalyst 19 is detected is configured with in ratio exhaust emission control catalyst 19 position downstream of outlet pipe 11
2sensor 21.In addition, O is not limited to
2sensor 21, as long as the oxygen concentration that can detect exhaust, also can use air-fuel ratio sensor etc. to replace O
2sensor 21.O
2sensor 21 is corresponding with oxygen concentration detection unit of the present invention.
Be provided with and carry out for combustion motor 1 ECU (ElectronicControlUnit: electronic control unit) 22 that controls with internal-combustion engine 1.ECU22 is the unit that the operating condition carrying out combustion motor 1 according to the operating condition of internal-combustion engine 1, the requirement of driver carries out controlling.ECU22 is connected to oxygenated fuel concentration sensor 15, air-fuel ratio sensor 18, catalyst-temperature pickup 20 and O via electric wiring
2the various sensors such as sensor 21, the output signal of above-mentioned various sensor is transfused to ECU22.On the other hand, ECU22 is connected to spark plug 7, first Fuelinjection nozzle 12, second Fuelinjection nozzle 13 and closure 17 etc. via electric wiring, and the said equipment controls by ECU22.
Catalyst degradation judges to control
ECU22 uses the oxygen storage capacity (OSC) of exhaust emission control catalyst 19, makes the air fuel ratio of the exhaust of discharging from internal-combustion engine 1 change to dense side and rare side, and to the change of this air fuel ratio and O
2whether the change of the output of sensor 21 compares, judge exhaust emission control catalyst 19 deterioration.Specifically, make the air fuel ratio of the exhaust of discharging from internal-combustion engine 1 change to dense side and rare side, and utilize air-fuel ratio sensor 18 to detect the change of this air fuel ratio.Now, in exhaust emission control catalyst 19, discharge oxygen when the air fuel ratio be vented is positioned at dense side, the occlusion oxygen when the air fuel ratio be vented is positioned at rare side.If deterioration does not occur exhaust emission control catalyst 19, then the ability discharging oxygen or occlusion oxygen is high, and exhaust emission control catalyst 19 similarly discharges oxygen or occlusion oxygen with the change of the air fuel ratio of exhaust.Therefore, as shown in Figure 2, the oxygen concentration in exhaust emission control catalyst 19 downstream and O
2the checkout value of sensor 21 similarly changes.On the other hand, when deterioration occurs exhaust emission control catalyst 19, the ability that exhaust emission control catalyst 19 discharges oxygen or occlusion oxygen reduces.Therefore, the oxygen concentration that there is exhaust emission control catalyst 19 downstream as shown in Figure 3 not with O
2the checkout value of sensor 21 is similar and the situation that variable quantity slightly changes.Further, the oxygen concentration that there is exhaust emission control catalyst 19 downstream as shown in Figure 4 not with O
2the checkout value of sensor 21 is similar, relative to the situation that the air fuel ratio cycle of exhaust changes with staggering.When shown in above-mentioned Fig. 3 and Fig. 4, can judge that exhaust emission control catalyst 19 is deteriorated.Like this, when utilizing O
2when sensor 21 detects the oxygen concentration flowed out from exhaust emission control catalyst 19, whether can similarly change with the checkout value of air-fuel ratio sensor 18 deterioration detecting exhaust emission control catalyst 19 according to the oxygen concentration in exhaust emission control catalyst 19 downstream.This control is called catalyst degradation to judge to control, the ECU22 performing this control is corresponding with catalyst degradation judging part of the present invention.
When using the oxygen storage capacity of exhaust emission control catalyst 19 to be exhausted the degradation of cleaning catalyst 19 in the above described manner, making the air fuel ratio of the exhaust of discharging from internal-combustion engine 1 change to dense side discharges or makes the air fuel ratio of the exhaust of discharging from internal-combustion engine 1 to change to rare side to make exhaust emission control catalyst 19 occlusion oxygen to make oxygen from exhaust emission control catalyst 19, and detects oxygen concentration now.Herein, when utilizing CNG as fuel, catalyzer stoichiometric point is positioned at dense side, because the knock limit of dense side is narrow, the air fuel ratio of exhaust therefore cannot be made to change to dense side significantly.Further, for CNG, in fuel, more than 90% is methane, and the ability that methane makes oxygen discharge from exhaust emission control catalyst 19 is low, and the oxygen concentration that therefore cannot make exhaust emission control catalyst 19 downstream and the situation making the air fuel ratio of exhaust change to dense side similarly rise.Therefore, to be difficult to make the air fuel ratio of the exhaust of discharging from internal-combustion engine 1 change to dense side as CNG only utilizing, even and if make the air fuel ratio of exhaust change to dense side, be also difficult to make compared with liquid fuel occlusion in the gaseous fuel that the oxygen evolution of exhaust emission control catalyst 19 goes out as fuel when, catalyst degradation cannot be utilized exactly to judge the deterioration controlling to detect exhaust emission control catalyst 19.
Therefore, in the present embodiment, when performing catalyst degradation and judging to control, even if to make the air fuel ratio of the exhaust of discharging from internal-combustion engine 1 change to dense side as CNG, be also difficult to make occlusion compared with liquid fuel in the gaseous fuel that the oxygen evolution of exhaust emission control catalyst 19 goes out is as fuel, based on O when only utilizing
2the change of only rare side of the output of sensor 21 and O
2whether one party in the dense side of the output of sensor 21 and the change of rare side judges exhaust emission control catalyst 19 deterioration.
According to the present embodiment, when based on a side, O
2the change of only rare side of the output of sensor 21 judge exhaust emission control catalyst 19 whether deterioration time, even if it is also harmless that the air fuel ratio of exhaust cannot be made to change to dense side significantly, and the oxygen concentration that can make exhaust emission control catalyst 19 downstream similarly declines with the situation making the air fuel ratio of exhaust change to rare side.When based on the opposing party, O
2the dense side of the output of sensor 21 and the change of rare side judge exhaust emission control catalyst 19 whether deterioration time, O when can also consider to make the air fuel ratio of exhaust to change to dense side
2the output of sensor 21.Thereby, it is possible to detect the deterioration of exhaust emission control catalyst 19 exactly.
Further, in the present embodiment, when performing catalyst degradation and judging to control, when based on O
2the dense side of the output of sensor 21 and the change of rare side judge whether exhaust emission control catalyst 19 should when deterioration, feed fluid fuel.
For liquid fuel, catalyzer stoichiometric point is not positioned at dense side, there is not the situation that the knock limit of dense side is narrow yet, therefore, it is possible to make the air fuel ratio of exhaust change to dense side significantly.Further, liquid fuel is different from CNG, and the oxygen concentration that can make exhaust emission control catalyst 19 downstream and the situation making the air fuel ratio of exhaust change to dense side similarly rise.Thus, O when also can change to dense side according to making the air fuel ratio of exhaust
2the output of sensor 21 detects the deterioration of exhaust emission control catalyst 19 exactly.
Further, in the present embodiment, when supplied liquid fuel contains oxygenated fuel, the concentration of the oxygenated fuel detected by oxygenated fuel concentration sensor 15 is higher, reduces the ratio of the liquid fuel supplied.Such as, when liquid fuel is that when containing alcohols as oxygenated fuel in the oil, alcohol concentration is higher, the ratio of the liquid fuel supplied when performing catalyst degradation and judging control is reduced.
The concentration of oxygenated fuel is higher, more easily makes exhaust emission control catalyst 19 discharge the oxygen of occlusion when making the air fuel ratio of the exhaust of discharging from internal-combustion engine 1 change to dense side.Therefore, the concentration of oxygenated fuel is higher, reduces the ratio of the liquid fuel supplied, even if exhaust emission control catalyst 19 also can be made to discharge the oxygen of occlusion like this.
Further, in the present embodiment, the temperature of the exhaust emission control catalyst 19 utilizing catalyst-temperature pickup 20 to detect is higher, reduces the ratio of the liquid fuel supplied.
The temperature of exhaust emission control catalyst 19 is higher, more easily makes exhaust emission control catalyst 19 discharge the oxygen of occlusion when making the air fuel ratio of the exhaust of discharging from internal-combustion engine 1 change to dense side.Therefore, the temperature of exhaust emission control catalyst 19 is higher, reduces the ratio of the liquid fuel supplied, even if exhaust emission control catalyst 19 also can be made to discharge the oxygen of occlusion like this.
And then, in the present embodiment, when performing catalyst degradation and judging to control, when based on O
2the change of only rare side of the output of sensor 21 judge exhaust emission control catalyst 19 whether deterioration time, the central point when the dense side of the air fuel ratio making the exhaust of discharging from internal-combustion engine 1 and rare side change is offset to rare side.
Thus, even if the catalyzer stoichiometric point of CNG be positioned at dense side, dense side knock limit narrow, because central point offsets to rare side, therefore, it is possible to make the air fuel ratio of exhaust of discharging from internal-combustion engine 1 change to dense side and rare side.Therefore, also O can be made
2increasing with being changed significantly of rare side of the output of sensor 21.
In addition, when based on O
2the dense side of the output of sensor 21 and the change of rare side judge exhaust emission control catalyst 19 whether deterioration time, the central point when making the air fuel ratio of exhaust change to dense side and rare side also can be made to offset to rare side.
Catalyst degradation during CNG is used to judge control program
Fig. 5 illustrates when only using CNG, and catalyst degradation when carrying out the use CNG of catalyst degradation judgement control judges the flow chart of control program.Based on the flow chart shown in Fig. 5, catalyst degradation when using CNG is judged that control program is described.This program is performed every the stipulated time repeatedly by ECU22.
When performing this program, first, in S101, judge whether fuel only uses CNG.When make judgement certainly in S101, shift to S102.When making a negative judgment in S101, temporarily terminate this program.
In S102, when fuel only uses CNG, judge whether to exist the request utilizing catalyst degradation judgement to control to carry out catalyst degradation judgement.Carry out catalyst degradation judge control 1 the continuous on-stream period being set as internal-combustion engine opportunity between in any opportunity.When make judgement certainly at S102, shift to S103.When making a negative judgment at S102, temporarily terminate this program.
In S103, judging whether can based on O
2the change of only rare side of the output of sensor 21 judges the deterioration of exhaust emission control catalyst 19.That is, in S103, selection is based on O
2the change of only rare side of the output of sensor 21 judge exhaust emission control catalyst 19 deterioration or based on O
2the dense side of the output of sensor 21 and the change of rare side judge the one party in the deterioration of exhaust emission control catalyst 19.Can based on O
2the change of only rare side of the output of sensor 21 judges the situation of the deterioration of exhaust emission control catalyst 19, is do not consider O
2when the change of the dense side of the output of sensor 21 also can judge the state of deterioration of exhaust emission control catalyst 19.In S103, the air fuel ratio of the exhaust of discharging from internal-combustion engine 1 is made only to change 1 time in dense side and rare side, if O now
2the variable quantity of the output of sensor 21 is large and more than predetermined established amount, then select based on O
2the change of only rare side of the output of sensor 21 judges the deterioration (S103 is as certainly judging) of exhaust emission control catalyst 19.On the other hand, the air fuel ratio of the exhaust of discharging from internal-combustion engine 1 is made only to change 1 time in dense side and rare side, if O now
2the not enough predetermined established amount of variable quantity of the output of sensor 21, then cannot based on O
2the change of only rare side of the output of sensor 21 judges the deterioration of exhaust emission control catalyst 19.Therefore, at O
2when the variable quantity of the output of sensor 21 is not enough established amount, select based on O
2the dense side of the output of sensor 21 and the change of rare side judge the deterioration (S103 is as negating judgement) of exhaust emission control catalyst 19.When S103 is judgement certainly, shift to S104.When S103 is negative judgement, shift to S105.
In S104, carry out based on O
2the change of only rare side of the output of sensor 21 judges that the catalyst degradation of the deterioration of exhaust emission control catalyst 19 judges to control.Judge, in control, to spray CNG from the second Fuelinjection nozzle 13 at the catalyst degradation of S104, but not from the first Fuelinjection nozzle 12 injecting LPG in liquefied condition.And then, the central point when making the air fuel ratio of the exhaust of discharging from internal-combustion engine 1 change to dense side and rare side being offset to rare side, making the air fuel ratio of exhaust slightly change to dense side, change to rare side significantly.And then, utilize air-fuel ratio sensor 18 to the change of the air fuel ratio to rare side that detect exhaust.Further, O is utilized
2sensor 21 detects the oxygen concentration in exhaust emission control catalyst 19 downstream when making the air fuel ratio of exhaust change to rare side.Thus, if O
2the situation that the oxygen concentration that the output of sensor 21 illustrates exhaust emission control catalyst 19 downstream similarly declines with the situation making the air fuel ratio of exhaust change to rare side, be then judged to be that exhaust emission control catalyst 19 deterioration does not occur.On the other hand, if O
2the output of sensor 21 illustrates and the situation that the oxygen concentration in exhaust emission control catalyst 19 downstream does not similarly change with the situation making the air fuel ratio of exhaust change to rare side is then judged to be that deterioration occurs exhaust emission control catalyst 19.After the process of S104, temporarily terminate this program.
In S105, carry out based on O
2the dense side of the output of sensor 21 and the change of rare side judge that the catalyst degradation of the deterioration of exhaust emission control catalyst 19 judges to control.Judge, in control, while the first Fuelinjection nozzle 12 injecting LPG in liquefied condition, spraying CNG from the second Fuelinjection nozzle 13 at the catalyst degradation of S105, make the air fuel ratio of the exhaust of discharging from internal-combustion engine change to dense side and rare side.Herein, utilize the concentration of the oxygenated fuel of oxygenated fuel concentration sensor 15 tracer liquid fuel, as shown in Figure 6, the concentration of oxygenated fuel is higher, reduces the ratio of the liquid fuel supplied.That is, the concentration of oxygenated fuel is higher, reduces liquid fuel emitted dose.Further, as shown in Figure 7, for exhaust emission control catalyst 19, the temperature of exhaust emission control catalyst 19 is higher, and oxygen storage capacity is higher.For the oxygen storage capacity of exhaust emission control catalyst 19, when for oxygen storage capacity during new product the highest, along with constantly using, oxygen storage capacity reduces.Therefore, utilize catalyst-temperature pickup 20 to detect the temperature of exhaust emission control catalyst 19, as shown in Figure 8, the temperature of exhaust emission control catalyst 19 is higher, reduces the ratio of the liquid fuel supplied.That is, the temperature of exhaust emission control catalyst 19 is higher, reduces liquid fuel emitted dose.In the S105 of the present embodiment, although spraying CNG from the second Fuelinjection nozzle 13 while the first Fuelinjection nozzle 12 injecting LPG in liquefied condition, also can only from the first Fuelinjection nozzle 12 injecting LPG in liquefied condition.And then, utilize air-fuel ratio sensor 18 to the air fuel ratio detecting exhaust to the change of dense side and rare side.Further, O is utilized
2sensor 21 detects the oxygen concentration in exhaust emission control catalyst 19 downstream when making the air fuel ratio of exhaust change to dense side and rare side.Thus, if O
2the situation that the output oxygen concentration that exhaust emission control catalyst 19 downstream is shown and the situation making the air fuel ratio of exhaust change to dense side of sensor 21 similarly rise, the oxygen concentration in exhaust emission control catalyst 19 downstream similarly declines with the situation making the air fuel ratio of exhaust change to rare side, be then judged to be that exhaust emission control catalyst 19 deterioration does not occur.On the other hand, if O
2the output of sensor 21 illustrates and the situation that the oxygen concentration in exhaust emission control catalyst 19 downstream does not similarly change with the situation making the air fuel ratio of exhaust change to dense side and rare side is then judged to be that exhaust emission control catalyst 19 is deteriorated.After the process of S105, temporarily terminate this program.
According to this program be explained above, even if when only using CNG as fuel, the deterioration of the exhaust emission control catalyst 19 of application in the internal-combustion engine 1 that can use CNG and liquid fuel also can be detected exactly.Further, the supply of liquid fuel can be made to be required inferior limit, the deterioration of the exhaust emission caused because of feed fluid fuel can be suppressed.
Other example
In addition, apparatus structure of the present invention can be applied and be not limited to the structure shown in Fig. 1.Such as, also can at the ratio O of outlet pipe 11
2sensor 21 position configuration NOx purification catalyst downstream.When configuring NOx purification catalyst, even if judge to make exhaust air-fuel ratio be rare in control at catalyst degradation, also can make NOx not to downstream blowout, the deterioration of exhaust emission can be suppressed.
In the present embodiment, first Fuelinjection nozzle 12 is arranged at intake duct 5, but, also the first Fuelinjection nozzle 12 can be arranged in the cylinder 2 of internal-combustion engine 1, and catalyst degradation judge control in make from the opportunity of the first Fuelinjection nozzle 12 injecting LPG in liquefied condition be the opportunity of exhaust stroke.Further, also can be arranged at outlet pipe 11 the interpolation valve that catalyst degradation judges adding liquid fuel in control in addition.Thus, catalyst degradation judge control in, liquid fuel can not be fed into internal-combustion engine 1 cylinder 2 so that in cylinder 2 combustion, can burn deterioration be avoided.
Other
Catalyst deterioration detecting apparatus involved in the present invention is not limited to above-described embodiment, can apply various change without departing from the spirit and scope of the invention.Further, above-described embodiment is also the embodiment of catalyst degradation detection method involved in the present invention.
Description of reference numerals:
1: internal-combustion engine; 2: cylinder; 3: piston; 4: firing chamber; 5: intake duct; 6: air outlet flue; 7: spark plug; 8: intake valve; 9: exhaust valve; 10: suction tude; 11: outlet pipe; 12: the first Fuelinjection nozzles; 13: the second Fuelinjection nozzles; 14: the first fuel tanks; 15: oxygenated fuel concentration sensor; 16: the second fuel tanks; 17: closure; 18: air-fuel ratio sensor; 19: exhaust emission control catalyst; 20: catalyst-temperature pickup; 21:O
2sensor; 22:ECU.
Claims (6)
1. a catalyst deterioration detecting apparatus, possesses:
Exhaust emission control catalyst, it is arranged at the exhaust passageway of the internal-combustion engine that can use gaseous fuel and liquid fuel;
Oxygen concentration detection unit, it is arranged at than above-mentioned exhaust emission control catalyst above-mentioned exhaust passageway downstream; And
Catalyst degradation judging part, it makes the air fuel ratio of the exhaust of discharging from above-mentioned internal-combustion engine change to dense side and rare side, the change of the change of this air fuel ratio and the output of above-mentioned oxygen concentration detection unit is compared, judges the whether deterioration of above-mentioned exhaust emission control catalyst
The feature of above-mentioned catalyst deterioration detecting apparatus is,
Even if change to dense side when only making the air fuel ratio of the exhaust of discharging from above-mentioned internal-combustion engine, when being also difficult to make occlusion in the gaseous fuel that the oxygen evolution of above-mentioned exhaust emission control catalyst goes out, above-mentioned catalyst degradation judging part judges the whether deterioration of above-mentioned exhaust emission control catalyst based on the one party in following change, is above-mentionedly changed to: air fuel ratio is the change of the output of above-mentioned oxygen concentration detection unit when rare side and the change of air fuel ratio output of above-mentioned oxygen concentration detection unit when dense side and rare side only.
2. catalyst deterioration detecting apparatus according to claim 1, wherein,
When above-mentioned catalyst degradation judging part based on the dense side of the output of above-mentioned oxygen concentration detection unit and the change of rare side judge above-mentioned exhaust emission control catalyst whether deterioration time, feed fluid fuel.
3. catalyst deterioration detecting apparatus according to claim 2, wherein,
When supplied liquid fuel contains oxygenated fuel, the concentration of above-mentioned oxygenated fuel is higher, reduces the ratio of the liquid fuel supplied.
4. catalyst deterioration detecting apparatus according to claim 2, wherein,
The temperature of above-mentioned exhaust emission control catalyst is higher, reduces the ratio of the liquid fuel supplied.
5. catalyst deterioration detecting apparatus according to claim 1, wherein,
Above-mentioned catalyst degradation judging part makes central point offset to rare side, and this central point makes central point when changing to dense side and rare side from the air fuel ratio of the exhaust of internal-combustion engine discharge.
6. a degradation detection for exhaust emission control catalyst, this exhaust emission control catalyst is arranged at the exhaust passageway of the internal-combustion engine that can use gaseous fuel and liquid fuel, and the degradation detection of this exhaust emission control catalyst has:
Oxygen concentration detecting step, its oxygen concentration contrasting above-mentioned exhaust emission control catalyst above-mentioned exhaust passageway downstream detects; And
Catalyst degradation determining step, it makes the air fuel ratio of the exhaust of discharging from above-mentioned internal-combustion engine change to dense side and rare side, the change of the oxygen concentration detected in the change of this air fuel ratio and above-mentioned oxygen concentration detecting step is compared, judges the whether deterioration of above-mentioned exhaust emission control catalyst
The feature of the degradation detection of above-mentioned exhaust emission control catalyst is,
Even if change to dense side only making the air fuel ratio of the exhaust of discharging from above-mentioned internal-combustion engine, when being also difficult to make occlusion in the gaseous fuel that the oxygen evolution of above-mentioned exhaust emission control catalyst goes out to make above-mentioned internal combustion engine operation, whether above-mentioned catalyst degradation determining step judges the deterioration of above-mentioned exhaust emission control catalyst based on the one party in following change, above-mentionedly to be changed to: the change of the oxygen concentration that air fuel ratio only detects in above-mentioned oxygen concentration detecting step when rare side, and the change of oxygen concentration that air fuel ratio detects in above-mentioned oxygen concentration detecting step when dense side and rare side.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2010/064915 WO2012029141A1 (en) | 2010-09-01 | 2010-09-01 | Catalyst deterioration detection device and method |
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| CN103109053B true CN103109053B (en) | 2016-01-20 |
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| US (1) | US8789357B2 (en) |
| EP (1) | EP2613032B1 (en) |
| JP (1) | JP5370586B2 (en) |
| CN (1) | CN103109053B (en) |
| BR (1) | BR112012005529A2 (en) |
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| US9670819B2 (en) * | 2012-05-28 | 2017-06-06 | Toyota Jidosha Kabushiki Kaisha | Catalyst deterioration determination system |
| CN104279035B (en) * | 2013-07-11 | 2016-05-11 | 苏州奥易克斯汽车电子有限公司 | The diagnostic method of the catalyst converter of engine |
| KR20160039344A (en) * | 2014-10-01 | 2016-04-11 | 두산인프라코어 주식회사 | Method for controlling engine to maintain performance of oxidation catalyst |
| JP7211388B2 (en) * | 2020-03-25 | 2023-01-24 | トヨタ自動車株式会社 | Catalyst reuse evaluation system |
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- 2010-09-01 EP EP10856692.8A patent/EP2613032B1/en not_active Not-in-force
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| Publication number | Publication date |
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| BR112012005529A2 (en) | 2017-02-21 |
| EP2613032A1 (en) | 2013-07-10 |
| JPWO2012029141A1 (en) | 2013-10-28 |
| EP2613032A4 (en) | 2015-01-14 |
| CN103109053A (en) | 2013-05-15 |
| WO2012029141A1 (en) | 2012-03-08 |
| EP2613032B1 (en) | 2017-05-10 |
| US20130186066A1 (en) | 2013-07-25 |
| US8789357B2 (en) | 2014-07-29 |
| JP5370586B2 (en) | 2013-12-18 |
| IN2012DN02272A (en) | 2015-08-21 |
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